General information
Offer title : M/F Doctoral internship in geological ang hydraulic mapping (H/F)
Reference : UMR7330-NOEGAR-051
Number of position : 1
Workplace : AIX EN PROVENCE
Date of publication : 21 February 2024
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 April 2024
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Section(s) CN : Earth and telluric planets: structure, history, models
Description of the thesis topic
In the context of flood risk prevention, the thesis aims to establish a geological methodology, based on the observation of bedrock and soils, making it possible to characterize and predict their hydraulic properties on a local to regional scale, and particularly their infiltration capacities (water, pollution). The method will be calibrated and applied to the territory of the Métropole d’Aix-Marseille Provence (MAMP). The analysis protocol will lead to defining and mapping “hydraulic types” which depend on intrinsic parameters such as porosity, permeability and infiltration capacity.
The doctoral work will be organized in 4 stages leading to the creation of a digital surface model of the hydraulic types of the territory of the Aix-Marseille Provence Metropole.
-Step 1: observation on the ground (visible surface) of the hydraulic types of outcropping rocks and soils, and georeferencing on a topographic map.
-Step 2: interpolation of the observed hydraulic types, to a surface grid (< 104 m2) on the basis of specific geological rules established in the area of interest (e.g. relationships between stratigraphic formations and hydraulic types or between geological structures and hydraulic types).
-Step 3: establishment of local 2D-3D hydraulic concepts based on local geological data and observation of hydraulic types.
-Step 4: deterministic digital surface model of hydraulic types at a resolution < 104 m2 based on observations (step 1), interpolation of hydraulic types and geological rules (step 2) and 2D-3D hydraulic concepts (step 3).
The function will be carried out at CEREGE, Saint-Charles site, 3 Place Victor Hugo 13331 Marseille The recruited person will join the team: RHYCA (Resources Hydrosystems Carbonates.
Work Context
——–The doctoral student will have the following mission:
• Mapping the natural infiltration capacities of the soil and bedrock of the entire territory with a mesh size of 250×250 m;
• Quantification of high infiltration capacities in critical sectors (if rainfall-runoff data are available, by integrating other surface parameters (slopes, vegetation, soils);
• Estimation and mapping of uncertainties associated with natural infiltration capacities;
• The production of conceptual hydraulic and hydrogeological models by critical sectors, taking into account urban planning;
• Estimation and mapping of the dewatering potential of urban and peri-urban areas;
• Identification of natural areas to be protected as a priority in relation to the risk of flooding and their significant infiltration capacity
• Historical analysis of floods (location and intensity in the MAMP region) based on the spatial relationships between effective infiltration capacities and rainfall intensity.
The function will be carried out at CEREGE, Saint-Charles site, 3 Place Victor Hugo 13331 Marseille The recruited person will join the team: RHYCA (Resources Hydrosystems Carbonates)
Constraints and risks
none
